Crystal Harris and Hugh Hefner in 2009. / Denise Truscello, WireImage

by Ann Oldenburg, USA TODAY

by Ann Oldenburg, USA TODAY

Hugh Hefner, 86, and Crystal Harris, 26, who were engaged in 2011 but didn't go through with a wedding because she called it off five days before it was set to happen, are engaged again, according to TMZ and E! News.